001/* 002 * (C) Copyright 2015-2019 Nuxeo (http://nuxeo.com/) and others. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 * 016 * Contributors: 017 * Florent Guillaume 018 */ 019package org.nuxeo.ecm.core.blob; 020 021import java.util.HashSet; 022import java.util.Set; 023 024import org.nuxeo.ecm.core.api.NuxeoException; 025import org.nuxeo.ecm.core.blob.binary.BinaryGarbageCollector; 026import org.nuxeo.ecm.core.blob.binary.BinaryManagerStatus; 027 028/** 029 * Basic implementation for a garbage collector recording marked blobs in memory. 030 */ 031public abstract class AbstractBlobGarbageCollector implements BinaryGarbageCollector { 032 033 // volatile as this is designed to be called from another thread 034 protected volatile long startTime; 035 036 protected BinaryManagerStatus status; 037 038 protected Set<String> marked; 039 040 @Override 041 public boolean isInProgress() { 042 return startTime != 0; 043 } 044 045 @Override 046 public void start() { 047 if (startTime != 0) { 048 throw new NuxeoException("Already started"); 049 } 050 startTime = System.currentTimeMillis(); 051 status = new BinaryManagerStatus(); 052 marked = new HashSet<>(); 053 } 054 055 @Override 056 public void stop(boolean delete) { 057 if (startTime == 0) { 058 throw new NuxeoException("Not started"); 059 } 060 try { 061 removeUnmarkedBlobsAndUpdateStatus(delete); 062 } finally { 063 status.gcDuration = System.currentTimeMillis() - startTime; 064 startTime = 0; 065 } 066 } 067 068 public void removeUnmarkedBlobsAndUpdateStatus(boolean delete) { 069 Set<String> unmarked = getUnmarkedBlobsAndUpdateStatus(); 070 marked = null; 071 if (delete) { 072 removeBlobs(unmarked); 073 } 074 } 075 076 public Set<String> getUnmarkedBlobsAndUpdateStatus() { 077 throw new UnsupportedOperationException(); 078 } 079 080 public void removeBlobs(Set<String> keys) { 081 throw new UnsupportedOperationException(); 082 } 083 084 @Override 085 public void mark(String digest) { 086 marked.add(digest); 087 } 088 089 @Override 090 public BinaryManagerStatus getStatus() { 091 return status; 092 } 093 094}